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Williston-Dinosaur Watershed Fish Mercury Investigation 2016 – 2018 Final Summary Report

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Williston-Dinosaur Watershed Fish Mercury Investigation 2016 – 2018 Final Summary Report Williston-Dinosaur Watershed Fish Mercury Investigation 2016 – 2018 Final Summary Report Prepared for: Fish & Wildlife Compensation Program, Peace Region 3333 22nd Ave. Prince George, BC V2N 1B4 September 2019 Azimuth Consulting Group Partnership 218-2902 West Broadway Vancouver BC, V6K 2G8 Project No. CO94394 Williston-Dinosaur Watershed Fish Mercury Investigation – 2016 – 2018 Summary Report EXECUTIVE SUMMARY Background The Fish & Wildlife Compensation Program (FWCP) recognizes that mercury concentrations of fish caught within the Williston and Dinosaur Watershed are a concern for local First Nations and stakeholders. Studies conducted in 1980 and 1988 first identified elevated fish mercury concentrations in Williston Reservoir, which led to the BC Ministry of Health issuing a fish consumption advisory in the 1990s that is still in place today. Few studies of the mercury status in Williston Reservoir have been conducted since implementation of the advisory. FWCP’s 2014 Reservoirs Action Plan identified mercury as a high-priority issue and defined objectives and specific actions to address this in the FWCP Peace Region. FWCP’s major goal is to improve our understanding of mercury in fish throughout the reservoir system and to provide this information to agencies responsible for advising the public on fish consumption. To that end, FWCP’s Peace Region Board selected Azimuth Consulting Group Partnership (Azimuth) through a public competitive bid process. Azimuth teamed with Chu Cho Environmental [CCE, Tsay Key Dene], Environmental Dynamics Inc. [EDI, Prince George] and Hagen and Associates [Prince George]) to conduct a multi-year (2016 to 2018) project to collect fish mercury information from the three major reaches of Williston Reservoir (Parsnip, Peace, Finlay), Dinosaur Reservoir and reference lakes (hereafter referred to as the “Williston-Dinosaur Watershed Fish Mercury Investigation1”). Approach Fish mercury concentrations are affected by a number of factors, such as species, size, growth rate, feeding preferences, food chain length, prey mercury concentrations, and limnological characteristics of a waterbody. Of these, species, size and location are the most important for characterizing fish mercury concentrations. Consequently, a species-specific approach was used that targeted the range of fish sizes for each location of interest. With the ultimate goal of collecting sufficient fish mercury data to revisit the fish consumption advisory, and given the size of the Williston-Dinosaur Watershed, it was foreseen that the required sampling effort would be substantial. Thus, an approach was developed to design a scientifically-defensible and efficient study that involved local communities and partner agencies. Key elements of this approach were: Multi-year study – allowed us to phase the study and provided an opportunity to learn and adjust the program to optimize the information. Assessment of Spatial Differences – given the size of the Williston-Dinosaur Watershed and the recognized need for establishing a regional context, spatial patterns in mercury concentrations for each species were assessed both within Williston-Dinosaur (i.e., among the three major reaches and Dinosaur) and relative to reference areas to help understand both the local and regional context. 1 While Objective 3a of the FWCP Peace Reservoirs Action Plan (FWCP 2014) includes addressing “potential effects on human health and the broader ecosystem”, these aspects were not included in the scope of the Williston-Dinosaur Watershed Fish Mercury Investigation. September 2019 i Williston-Dinosaur Watershed Fish Mercury Investigation – 2016 – 2018 Summary Report Species-complex focus – four “key species” were selected to focus the study: lake trout (Salvelinus namaycush), bull trout (S. confluentus), lake whitefish (Coregonus clupeaformis), and kokanee (Oncorhynchus nerka). These represent two top predatory species and their prey. Other species were sampled too for context, but not for full mercury characterization. First Nations community involvement –was an important element of the study. In addition to visiting local First Nations communities to share information on this study, training opportunities and sampling kits were provided and the communities were encouraged to collect fish tissue samples. Many of the fish samples obtained in this study were from local First Nations communities. In addition, trained community members were also part of the Azimuth sampling teams. Partnerships with other studies – the team worked with other organizations conducting fisheries studies in the Williston-Dinosaur Watershed or in appropriate reference areas to obtain additional samples. Ancillary Ecological Information – fish acquire mercury almost exclusively via their food and so diet and food web structure (along with fish species, fish size, and age) have a strong influence on fish mercury concentrations. In addition to basic biological information, stable isotope analysis (SIA) was used to help determine feeding relationships among fish. Factoring Size into Fish Mercury Characterization – mercury concentrations are known to increase with fish size, particularly for large, predatory species. To avoid size-related bias, comparisons of fish mercury concentrations among locations focused on specific sizes, called “standard” sizes, for each species. Implications for Human Health – while this study is not a human health risk assessment, we have tried to provide some health-related context from a mercury exposure perspective. Results Over 1400 fish mercury samples were amassed from 16 species of fish in the dataset for the four Williston-Dinosaur locations and eight reference waterbodies; data sources included direct sampling, collaborative efforts, and other fish studies. The majority of mercury samples were collected from the four key species. A large rainbow trout dataset was also amassed to the credit of collaborative efforts. Results for key species and rainbow trout were as follows: Lake Trout Data – 304 samples from eight locations (Parsnip Reach, Finlay Reach, Peace Reach, Dinosaur, and four reference locations – Fraser Lake, Kloch Lake, Takatoot Lake, and Tezzeron Lake). Analysis – there was a strong length mercury relationship across most locations; standard sizes were 400 mm, 550 mm, 700 mm, and 850 mm. Differences Within Williston-Dinosaur – the highest tissue concentrations across size classes were seen in Finlay and Parsnip reaches, followed by Peace Reach and then Dinosaur. Mercury concentrations ranged from <0.1 mg/kg wet weight (ww) in Dinosaur (400-mm and 550-mm size classes) to 0.65 mg/kg ww in Parsnip Reach (850-mm). September 2019 ii Williston-Dinosaur Watershed Fish Mercury Investigation – 2016 – 2018 Summary Report Regional Context – mercury concentrations were generally similar among Williston-Dinosaur and reference locations. Bull Trout Data – 375 samples from nine locations (Parsnip Reach, including Scott Creek, Parsnip River, and Crooked River; Finlay Reach, including Chowika Creek, Davis River, Ingenika River, Pesika River, Swannell River, and Finlay River; Peace Reach; Dinosaur; and five reference locations – Kootenay Lake, Thutade Lake, South Thompson River, Tchentlo Lake, and Peace River). Analysis – there was a fairly strong length-mercury relationship; standard sizes were 400 mm, 550 mm, and 700 mm. Differences Within Williston-Dinosaur – highest tissue mercury concentrations across the three standard sizes were seen in the Crooked River2 (0.23 to 0.69 mg/kg ww), followed by Parsnip Reach (0.2 to 0.37 mg/kg ww). Next were the Finlay and Peace reaches, which had similar concentrations (0.12 to 0.31 mg/kg ww). Dinosaur Reservoir had the lowest concentrations (0.08 to 0.1 mg/kg ww), with a weak length-mercury relationship. Regional Context – mercury concentrations were generally similar among Williston-Dinosaur and reference locations. Bull trout tissue concentrations in reference waterbodies ranged from 0.096 mg/kg ww at Thutade Lake for a 400-mm fish to 0.5 mg/kg ww at the South Thompson River for a 700-mm fish. Crooked River fish were the highest across all sites, but were within the range of the 95% confidence intervals of at least one reference waterbody for the 550-mm and 700-mm size classes. Changes over Time – mercury concentrations in fish in a reservoir generally follow a pattern of increasing after the reservoir is flooded, reaching a peak mercury concentration, and then declining over time. The concentrations of mercury measured in bull trout from Williston Reservoir in this study were, on average, about five times lower than the concentrations of mercury measured in bull trout from Williston Reservoir from 1980 to 2000. Bull trout were the only species of fish for which there were sufficient historical data to look at changes in mercury concentrations over time. Lake Whitefish Data – 144 samples from nine locations (Parsnip Reach, Finlay Reach, Peace Reach, Dinosaur, and five reference locations – Fraser Lake, Kloch Lake, Takatoot Lake, Tezzeron Lake, and Peace River). Analysis – weak to moderate length-mercury relationships depending on location; standard size was 300 mm. 2 These data were from an earlier study (ERM 2015). While a tributary to Parsnip Reach, the data were kept separate to provide additional context for spatial and temporal patterns in fish mercury concentrations. September 2019 iii Williston-Dinosaur Watershed Fish Mercury Investigation – 2016 – 2018 Summary Report Differences Within Williston
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